| 摘要 |
PROBLEM TO BE SOLVED: To provide an arc current discriminating method and an arc current discriminator which can detect the abnormal current of an AC circuit caused by the arc short circuit phenomena by the short circuit between core wires or the series arc phenomena by the cutting of the core wire without causing incorrect detection with a normal load current. SOLUTION: In this arc current discriminating method, this arc current discriminator detects each current peak time A(n) until the point of time when it comes to the current peak values Ipeak1, Ipeak2 etc. of a positive half wave and the current peak values Ipeak1' and Ipeak2' of a negative half wave from the point of time of zero cross of power voltage, and computing the absolute valueΔA(n)=IA(n)-A(n+1)I of the difference between the detected current peak time A(n) and the current peak time A(n+1) of a half wave after one cycle, and performs the integration of the absolute valuesΔA(n) of the differences between the current peak times during a period (t0-α) to t0, and compares this integrated value W=W+ΔA(n) with the threshold, and determines that an arc current is generated when the integrated value W is over the threshold. COPYRIGHT: (C)2004,JPO
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